Diagnosis System

1. Using Techstream, select "CAN Bus Check" from the "System Select".

1. Systems (ECUs, sensors) that adopt CAN communication vary depending on the vehicle's optional settings. Check which systems (ECUs, sensors) are installed on the vehicle.

   HINT:

   ECUs and sensors that are connected to the LIN communication system and the local CAN system are also displayed.

   DTC DETECTION ITEM REFERENCE CHART
   
   

   ECU/Sensor name	Check method
   ECM	Installed on all vehicles
   Combination meter	Installed on all vehicles
   Skid control ECU	Installed on all vehicles
   Steering angle sensor	Installed on all vehicles
   Yaw rate sensor	Installed on all vehicles
   Power steering ECU	Installed on all vehicles
   Center airbag sensor assembly	Installed on all vehicles
   Air conditioning amplifier	Installed on all vehicles
   Main body ECU	Installed on all vehicles
   Certification ECU	w/ Smart key system
   Back door ECU	w/ Power back door system
   Accessory gateway	w/ Remote engine start (car dealer option)

HINT:

• In the CAN communication system, CAN communication system DTCs can be displayed by the ECU using Techstream.
• If CAN communication system DTCs are output, trouble cannot be determined only by the DTCs. Perform troubleshooting according to "HOW TO PROCEED WITH TROUBLESHOOTING " .

1. ECM (2GR-FE)

   HINT:

   The ECM is connected to the CAN communication system, but CAN communication DTCs are not output.

2. ECM (1AR-FE)
   DTC DETECTION ITEM REFERENCE CHART
   
   

   DTC No.	Detection Item
   U0101*1	Lost Communication with Transfer Case Control Module
   HINT: DTC communication uses the CAN communication system. *1: The ECM is malfunctioning if only U0101 is output. Refer to SFI system (See DTC U0101 LOST COMMUNICATION WITH TCM ).

3. TCM (U760E/1AR-FE)
   DTC DETECTION ITEM REFERENCE CHART
   
   

   DTC No.	Detection Item
   U0100*2	Lost Communication with ECM/PCM "A"
   HINT: DTC communication uses the CAN communication system. *2: The TCM is malfunctioning if only U0100 is output. Refer to Automatic Transaxle system (See INSTALLATION ).

4. SKID CONTROL ECU

   HINT:

   DTC communication uses the CAN communication system.

   DTC DETECTION ITEM REFERENCE CHART
   
   

   DTC No.	Detection Item
   U0073	Control Module Communication Bus Off
   U0100	Lost Communication with ECM/PCM "A"
   U0123	Lost Communication with Yaw Rate Sensor Module
   U0124	Lost Communication with Lateral Acceleration Sensor Module
   U0126	Lost Communication with Steering Angle Sensor Module

5. AIR CONDITIONING AMPLIFIER

   HINT:

   • DTC communication uses the CAN communication system.
   • The following DTC is output only for current malfunctions.
     DTC DETECTION ITEM REFERENCE CHART
     
     

     DTC No.	Detection Item
     B1499	Multiplex Communication Circuit

6. COMBINATION METER

   HINT:

   DTC communication uses the CAN communication system.

   DTC DETECTION ITEM REFERENCE CHART
   
   

   DTC No.	Detection Item
   U0100	Lost Communication with ECM/PCM "A"
   U0129	Lost Communication with Brake System Control Module

7. POWER STEERING ECU

   HINT:

   DTC communication uses the CAN system.

   DTC DETECTION ITEM REFERENCE CHART
   
   

   DTC No.	Detection Item
   U0073	Control Module Communication Bus Off
   U0100	Lost Communication with ECM
   U0129	Lost Communication with Anti-lock Brake System (ABS) Control Module

8. MAIN BODY ECU

   HINT:

   DTC communication uses the CAN system.

   DTC COMBINATION CHART
   
   

   DTC No.	Detection Item
   U0327	Software Incompatibility with Vehicle Security Control Module
   U1002	Lost Communication with Gateway Module

9. CENTER AIRBAG SENSOR

   HINT:

   The center airbag sensor is connected to the CAN communication system, but CAN communication DTCs are not output.

10. STEERING ANGLE SENSOR

    HINT:

    The steering angle sensor is connected to the CAN communication system, but CAN communication DTCs are not output.

11. YAW RATE SENSOR

    HINT:

    The yaw rate sensor is connected to the CAN communication system, but CAN communication DTCs are not output.

12. CERTIFICATION ECU (w/ Smart key system)

    HINT:

    The certification ECU is connected to the CAN communication system, but CAN communication DTCs are not output.

13. BACK DOOR ECU (w/ Power back door system)

    HINT:

    The certification ECU is connected to the CAN communication system, but CAN communication DTCs are not output.

1. CAN No. 1 Bus
   DTC TROUBLE MODE CHART
   
   

   DTC		Trouble Mode
   Output from	Output DTC	ECM Communication Stop Mode	Skid Control ECU Communication Stop Mode	Steering Angle Sensor Communication Stop Mode	Yaw Rate Sensor Communication Stop Mode	Combination Meter ECU Communication Stop Mode
   Skid Control ECU	U0073	X	◦*1	X	X	X
   	U0100	◦	◦*1	X	X	X
   	U0123	X	◦*1	X	◦	X
   	U0124	X	◦*1	X	◦	X
   	U0126	X	◦*1	◦	X	X
   Combination Meter	U0100	◦	X	X	X	◦*1
   	U0129	X	◦	X	X	◦*1
   Power Steering ECU	U0100	◦	X	X	X	X
   	U0129	X	◦	X	X	X
   HINT: ◦: Set X: Not set or may be set according to the malfunctioning part when one side of the CAN bus wire opens *1: Does not output it during communication error

   FAIL-SAFE CHART
   
   

   DTC		Trouble Mode
   Output from	Output DTC	Air Conditioning Amplifier Communication Stop Mode	Center Airbag Sensor Communication Stop Mode	Power Steering ECU Communication Stop Mode	Main Body ECU Communication Stop Mode
   Skid Control ECU	U0073	X	X	X	X
   	U0100	X	X	X	X
   	U0123	X	X	X	X
   	U0124	X	X	X	X
   	U0126	X	X	X	X
   Combination Meter	U0100	X	X	X	X
   	U0129	X	X	X	X
   Power Steering ECU	U0100	X	X	◦*1	X
   	U0129	X	X	◦*1	X
   HINT: ◦: Set X: Not set or may be set according to the malfunctioning part when one side of the CAN bus wire opens *1: Does not output it during communication error ECM Communication Stop Mode (See ECM COMMUNICATION STOP MODE  ) Skid Control ECU Communication Stop Mode (See SKID CONTROL ECU COMMUNICATION STOP MODE  ) Steering Angle Sensor Communication Stop Mode (See STEERING ANGLE SENSOR COMMUNICATION STOP MODE  ) Yaw Rate Sensor Communication Stop Mode (See YAW RATE SENSOR COMMUNICATION STOP MODE  ) Air Conditioning Amplifier Communication Stop Mode (See AIR CONDITIONING AMPLIFIER COMMUNICATION STOP MODE  ) Combination Meter Communication Stop Mode (See COMBINATION METER ECU COMMUNICATION STOP MODE  ) Power Steering ECU Communication Stop Mode (See POWER STEERING ECU COMMUNICATION STOP MODE  ) Main Body ECU Communication Stop Mode (See MAIN BODY ECU COMMUNICATION STOP MODE  ) Center Airbag Sensor Communication Stop Mode (See CENTER AIRBAG SENSOR COMMUNICATION STOP MODE  )